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level: aiims and disha questions

Questions and Answers List

level questions: aiims and disha questions

Question	Answer
territoriality occurs as a result of	competition
abundance of species in a population, within habitat is called	niche density
july 11th is observed as	world population day
the great barrier reef along the east coast of austalia can be categorised as	ecosystem
presence of flagellated protozoans in the gut of termites are the examples of	symbiosis
the formula for exponential population growth is	dN/dt=rN
what is the formula for growth rate	birth+immigration- death+emmigration/total no.of population
leaf butterfly and stick insects show mimicry to dodge their enemy using mimicry, what is it?	mimicry is a method to aquire body colour blending with the suroundings
species are groups of potentially interbreeding natural populations which are isolated from other such groups	distinctive morphological characters are displayed due to reproductive isolation
large woody vines are more commonly found in	tropical rainforests
adaptaion to environment in desert lizards	burrowing in soil to escape high temperature
adaptations in kangaroo and rat	they feed on dry seeds and do not require drinking water. they excrete very concentrated urine and do not use water to regulate body temperature
are coniferous trees evergreen	yes coniferous trees are evergreen
what is a prairie	they are enormous streches of flat grassland with moderate temperatures, moderate rainfall, and few trees
diffuse porous woods are characteristic of plants growing in	tropics
cause of mimicry is	concealment
plants such as acasia, prosopis and capparis are examples of which tropical forest	thorn forest
species occuring in different geographical areas are called	allopatric
the high boiling point of water is advantageous to living organisms because	organisms can easily boil off enough water to keep themselves cool
xeric environment is characterised by	low atmospheric humidity
soil best suited for plant growth is	loamy
homeostatis is	tendency of biological systems to resist change
deep black soil is productive due to high proportion of	clay and humus
asymptote in a logistic growth curve is obtained by	K=N
rhodospirillum is a	bacteria
a sedentary sea anemone gets attached to the shell lining of hermit crab. the association is	commennsalism
which one of the following is one of the characteristics of a biological community	stratification
the population of an insect species shows an explosive increase in numbers during rainy season followed by its disappearance at the end of the season. what does it show?	its population growth curve is J-shaped
a high density of elephant in an area can result in	intra specific competition
two forces operate in the growth and development of every population. one of them relates to the ability to reproduce at a given rate. the force opposing it is called.	environmental resistance
in a population unrestricted reproductive capacity is called as	biotic potential
what is the correct sequence of stages of growth curve for bacteria	lag,log,stationary and decline phase
the semilog of per minute growing bacteria is plotted against time. what is it's shape?	ascending straight line
name some insectivorous plants	utricularia, drosera, dionaea
which type of association is found between entomophilous flower and pollinating agent	mutualism
exponential growth of cells is a characteristic feature of	tissue culture cells
a pair of insectivorous plants is	nepenthes and bladderword
human population in india	can be regulated by following the national programme of family planning
vivipary is a characteristic of	halophytes